[libcxx-commits] [libcxx] [libc++] Optimize ranges::{for_each, for_each_n} for segmented iterators (PR #132896)

[Peng Liu via libcxx-commits]

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@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_FOR_EACH_N_SEGMENT_H
+#define _LIBCPP___ALGORITHM_FOR_EACH_N_SEGMENT_H
+
+#include <__config>
+#include <__iterator/distance.h>
+#include <__iterator/next.h>
+#include <__iterator/segmented_iterator.h>
+#include <__utility/convert_to_integral.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// __for_each_n_segment optimizes linear iteration over segmented iterators. It processes a segmented
+// input range defined by (__first, __orig_n), where __first is the starting segmented iterator and
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winner245 wrote:

Done.

https://github.com/llvm/llvm-project/pull/132896